Hydraulic Throw out Bearing - Bolt On MC1300Hydraulic Throw out Bearing Bolt OnSuit GM Muncie with 1 1 8" x 10 & 1 1 8" x 26 Spline MC1300 1300 Bolt on hydraulic throw out bearings are used with bellhousings less than 6. 5" deep or where the measurement from the outside rear of the bell housing to the clutch fingers is less than 3". Bellhousings deeper than 6. 5" should use the slip on style bearing.